The center portion of a lane:

Oily drippings from cars collect in a strip in the center of each lane. Unless the road is wet, this area still generally offers enough traction for motorcyclists to safely ride. You should still avoid riding on big buildups of oil and grease, often found at busy intersections or near toll booths.

• Is always the best part of the lane for a motorcycle.
• Often contains oil and grease, but is usually safe for riding.
• Often contains oil and grease, and is never safe for riding.
• Is the smoothest part of the lane.